http://www.w3.org/ns/prov#value | - h functions are primitive features (i.e., not relative to use plans or other items), function essentialism may be upheld. 10 An early version of the use-plan analysis of artefact use and design can be found in Houkes et al. (2002); a modified and less schematic account is presented in Houkes and Vermaas (2004). 11 The useful-material definition of artefacts may be developed into a full-fledged ont
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